<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 300px;
            height: 300px;
            /* 锥形渐变 */
            background: conic-gradient(from 45deg, blue, red);
            background: conic-gradient(
                hsl(360, 100%, 50%),
                hsl(315, 100%, 50%),
                hsl(270, 100%, 50%),
                hsl(225, 100%, 50%),
                hsl(180, 100%, 50%),
                hsl(135, 100%, 50%),
                hsl(90, 100%, 50%),
                hsl(45, 100%, 50%),
                hsl(0, 100%, 50%)
            );
            background: conic-gradient(from 90deg at 0 0, blue, red);
            background: conic-gradient(red, orange, yellow, green, blue);
            background: conic-gradient(red 0deg, orange 90deg, yellow 180deg, green 270deg, blue 360deg);
        }
    </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>